html {
  font-size: 14px;
  font-family: 'Microsoft YaHei', 'Trebuchet MS', 'Ubuntu', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
  width: 100%;
  height: 100%;
}

header {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 200;
}

.content {
  position: absolute;
  top: 4rem;
  left: 0;
}